Temporal: Add tests for serialization of durations with pairs of units

These check that durations with large and small units are properly
serialized.

Author: ptomato

test/built-ins/Temporal/Duration/prototype/toJSON/large-with-small-units.js

@@ -0,0 +1,38 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.tojson
+description: Pairs of units with one large and one small
+features: [Temporal]
+---*/
+
+assert.sameValue(
+  new Temporal.Duration(1, 0, 0, 0, 0, 0, 0, 0, 0, 1).toJSON(),
+  "P1YT0.000000001S",
+  "years with nanoseconds"
+);
+
+assert.sameValue(
+  new Temporal.Duration(0, 1, 0, 0, 0, 0, 0, 0, 1).toJSON(),
+  "P1MT0.000001S",
+  "months with microseconds"
+);
+
+assert.sameValue(
+  new Temporal.Duration(0, 0, 1, 0, 0, 0, 0, 1).toJSON(),
+  "P1WT0.001S",
+  "weeks with milliseconds"
+);
+
+assert.sameValue(
+  new Temporal.Duration(0, 0, 0, 1, 0, 0, 1).toJSON(),
+  "P1DT1S",
+  "days with seconds"
+);
+
+assert.sameValue(
+  new Temporal.Duration(0, 0, 0, 0, 1, 1).toJSON(),
+  "PT1H1M",
+  "hours with minutes"
+);

test/built-ins/Temporal/Duration/prototype/toString/large-with-small-units.js

@@ -0,0 +1,38 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.tostring
+description: Pairs of units with one large and one small
+features: [Temporal]
+---*/
+
+assert.sameValue(
+  new Temporal.Duration(1, 0, 0, 0, 0, 0, 0, 0, 0, 1).toString(),
+  "P1YT0.000000001S",
+  "years with nanoseconds"
+);
+
+assert.sameValue(
+  new Temporal.Duration(0, 1, 0, 0, 0, 0, 0, 0, 1).toString(),
+  "P1MT0.000001S",
+  "months with microseconds"
+);
+
+assert.sameValue(
+  new Temporal.Duration(0, 0, 1, 0, 0, 0, 0, 1).toString(),
+  "P1WT0.001S",
+  "weeks with milliseconds"
+);
+
+assert.sameValue(
+  new Temporal.Duration(0, 0, 0, 1, 0, 0, 1).toString(),
+  "P1DT1S",
+  "days with seconds"
+);
+
+assert.sameValue(
+  new Temporal.Duration(0, 0, 0, 0, 1, 1).toString(),
+  "PT1H1M",
+  "hours with minutes"
+);